When that happens at my cinema they usually just give everyone a voucher for a free showing. They even did it once when the 3D was misaligned for a second. I’m didn’t even notice.
I still have memories of watching Mummy Returns and the film biting out right at the end. Someone had to cut that section out and reattach the film. I think we missed only a few seconds but they still gave us a free voucher. They were valuable back then since you had to pay exorbitant prices to watch a movie. Now it’s like £7
They offered vouchers, but the theater has really gone to seed. I used to go there a lot in pre pandemic days, and they used to have a lot of technical snafus like this. If and when I decide to return to theaters, I think I'll go to a better one. I only went to that one because it was the closest one with an IMAX auditorium.